Divisibility Check (for 2, 3)A number is divisible by 2 if its last digit is 0, 2, 4, 6 or 8. For example: 12, 5394, 993120. A number is divisible by 3 if sum of its digits is divisible by 3. For example: 72 is divisible by 3 as 7+2=9 which is divisible by 3.Another example: 57381, 5+7+3+8+1=24; 24 is divisible by 3. So 57381 is also divisible by 3.

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Divisibility Check (for 5, 7)A number is divisible by 5 if its last digit is 0 or 5. For example: 100, 3795, 698170. For 7, separate & double the last digit of the number. Then subtract it from the rest. Take: 91. 919 19 - (1*2) 7 Now, if the number is 0 or divisible by 7, then the original number is also divisible by 7.

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Divisibility Check (for 7)If the number is big then continue the process as many time as needed. Lets take 3752.3752 375 2*2 371 37 1*2 35 Now, 35 is divisible by 7. So, 3752 is also divisible by 7.You may have gone even further, 35 3 - 5*2 -7 ; which is also divisible by 7.20